A piece of clear aquarium type hose ( too bad you didn't put it on before installing the end) it might be a little tight getting over the ends .or maybe 2 or 3 layers of heat shrink would do it thats what i used on my chem pump linesthat would make this more secure? This is a replacement hose for a Sapphire Upholstery tool. it broke at this point (weakest link)
something like a hose bend restrictor on a solution line.
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